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First wort hopping is the practice of adding hops to kettle when you take first runnings from the mash tun. As the kettle fills you heat the wort to boiling. The "boil hops" are in the kettle before the boil begins and steep in the warm wort.

The best way to carry this over to extract brewing would be to add your first hops to the kettle when the wort reaches 150º-170ºF.